Nissan Qashqai (2007-2010). Manual — part 137

CAN COMMUNICATION

EC-67

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

CAN COMMUNICATION

System Description

INFOID:0000000001056149

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to

LAN-59, "CAN Communication Signal Chart"

, about CAN communication for detail.

EC-68

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

COOLING FAN CONTROL

COOLING FAN CONTROL

System Diagram

INFOID:0000000001056150

System Description

INFOID:0000000001056151

INPUT/OUTPUT SIGNAL CHART

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to ECM through CAN communication line.

SYSTEM DESCRIPTION

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].

Cooling Fan Operation

JMBIA0177GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

1

Cooling fan
control

IPDM E/R

↓

Cooling fan relay

↓

Cooling fan motor

Battery

Battery voltage*

1

Combination meter

Vehicle speed*

2

Engine coolant temperature sensor

Engine coolant temperature

BCM

Air conditioner ON signal*

2

Refrigerant pressure sensor

Refrigerant pressure

JMBIA0412GB

COOLING FAN CONTROL

EC-69

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

Component Parts Location

INFOID:0000000001060013

Cooling fan speed

Cooling fan relay

1

3

Stop (OFF)

OFF

OFF

Low (LOW)

ON

OFF

High (HI)

OFF

ON

1.

Ignition coil (with power transistor)
and spark plug

2.

Refrigerant pressure sensor

3.

Intake valve timing control solenoid
valve

4.

Knock sensor,
Crankshaft position sensor (POS)

5.

Fuel injector

6.

Camshaft position sensor (PHASE)

7.

Cooling fan motor

8.

IPDM E/R

9.

ECM

JMBIA0399ZZ

EC-70

< FUNCTION DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

COOLING FAN CONTROL

10. Mass air flow sensor (with intake

temperature sensor)

11.

Engine coolant temperature sensor

12. Electric throttle control actuator

(with built in throttle position sensor
and throttle control motor)

13. EVAP canister purge volume control

solenoid valve

1.

Mass air flow sensor

2.

Engine coolant temperature sensor

Vehicle front

1.

Electric throttle control actuator

2.

Camshaft position sensor (PHASE)

Vehicle front

1.

Ignition coil (with power transistor)
and spark plug

2.

Fuel injector

3

EVAP canister purge volume control
solenoid valve

Vehicle front

JMBIA0400ZZ

JMBIA0401ZZ

JMBIA0402ZZ